Boring-machine



2 SheetsSheet 2.

H LONGWELL.

BORING MAGHINE.

(No Model.)

HARLIN LONGWELL, OF ELKLAND, PENNSYLVANIA.

BORING-MACHINE.

SPECIFICATION forming part of Letters Patent. No. 392,960, dated November 13, 1888.

Application liled December 22, 1867. Serial No.l58,731.

(No model.)

v To aZZ whom it may concern:

Be it known that 1, HARLIN LONGWELL, of Elkland, in the county of Tioga and State of Pennsylvania, have invented certain new and useful Improvements in Boring-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in boring-machines, and more particularly to a type which is adapted for boring in wood or drilling holes in metals.

The object of my invention is to produce a wood-boring and metal-drilling machine that is of simple and substantial construction, has few working parts, easily manipulated, and that may be operated by manual or other power.

A further object is to construct a wood or metal boring machine that is adapted to feed the bit or anger automatically to the material operated upon, this feed being adjustable and proportioned to the speed of rotation of the cutting-tool.

With these objects in view my invention 0011- sists in certain features of construction and combinations of parts, that will be hereinafter described, and pointed out in the claims.

Referringtothc drawings, Figure l is a front elevation in perspective of the boringmachine. Fig. 2 is a side elevation of the device. Fig. 3 is a front elevation in section of the boring-machine, taken on an axial line through the feed-screw. Fig. 4 is a crosssection of the machine, taken through the friction-screw in the head of the feed-screw. Fig. 5 is a crosssection of the machine, taken on a line through the center of the driving bevel gear-wheel when this wheel is located opposite the lower threaded bracket-boss of the machine. I

This boring-machine is preferably secured to an upright column or vertical support, which may be made of wood or metal. For general uses, where the work is not very heavy and a cheap supporting-column is preferred to lower the cost of the tool, a wooden upright may be utilized.

A represents a wooden upright secured so as to afford a support to the working parts of the boring-machine.

B is the main frame of the machine. It is essentially a metal bracket having lateral flanges a, which are extended from its sides to afford means for securing the frame to the up right timber A. The bracket-frame B is further provided with two bosses, b b, which are perforated vertically and threaded to receive the hollow feed-screw H. The bosses I) I) are each constructed with a recess on one side, the edges of these recesses being undercut or dovetailed to afford boxes for the retention in place of the sliding bracket-plate I, which is thus held from lateral displacement and permitted to have a vertical reciprocating motion, as will be further explained.

At the lower end of the bracket-plate I an ear, f, is attached or integrally formed, which is perforated to receive the drill or bit spindle L, that is made of a proper diameter to rotate in the feed'serew H, which latter is perforated axially or longitudinally to receive the drillspindle.

Upon the outside of the sliding bracketplate I, near its lower end, a stud, g, is affixed, which projects at right angles from the face of this plate, and is intended to afford a revoluble support to the driving bevel gear-wheel D, this wheel having an elongated hub, D, that affords a proper bearing on the stud.

The drill-spindle L is diametrically enlarged to produce a shoulder immediately below the perforated earfof the bracket-plate I, against which this shoulder bearslooseiy,andupon this enlarged portion of the spindle a bevel-pinion, E, is mounted and rigidly secured.

The bevel-pinion E is so relatively located that its teeth will mesh with the teeth of the driving bevel gear-wheel D, and a handle, J, is adj ustably,but firmly, held in the projecting box h,so that the length of the handle may be altered to increase or diminish the leverage of the same by loosening the set-screwi of said box, moving the handle endwise, and resetting this screw to secure the handle firmly to the box 7, which latter is rigidly fastened to the outer face of the wheel I) at a proper point from its peripheral edge.

The lower end ofthe bit-spindleLis provided with a bit or drill chuck, F, which may be of any approved form to secure the wood-cutting anger or a metal-cutting drill in axial line with the spindle, and upon the upper end of this spindle L a balance-wheel, G, is secured by a set-screw or other means, this wheel being of proper diameter and weight to afford sufficient momentum to the drill-spindle to aid the operation of the drill or anger when in use.

At a proper distance below the bracketframe B a vertical rack,G,is secured to the face of the upright piece A, and a movable table, 0, is gibbed or otherwise attached to the rack C, so as to permit the table to be adjusted vertically and be held at any desired point by any preferred means. There are no new features of construction in this form of table; but it is shown as an adj unctive appliance to facilitate the drilling and boring operations of the ma chine by affording an adjustable support for the work that is to be operated upon.

As the screw H is designed by its rotatio to give the drill-spindle L a regular downward motion or feed proportionate to the speed of rotation of this spindle, a provision is made to adj ustably secure the spindle and screw together, and thus cause a rotation of the screw with the spindle. I

To effect the connection of parts just mentioned and afford an adjustable feed motion to the boring and drilling machine, a set-screw, c, is inserted in a tapped hole formed in the side of an enlargement, c, which is located at the upper end of the screw H. In the'bottom of the hole in which the screw 0 is inserted a washer, 0 is located, to have abearing against the drill-spindle L. The washer c is preferably made of leather or other flexible substance, either vulcanized gum or fibrous material. Upon the washer c a second metal washer, 0 is placed, upon which the set-screw z" bears with its square end. When the setscrew is made to forcibly engage the washer 0 the pliable washer c is pressed against; the spindle L, and holds it and the screw H, so that the latter will be fed downwardly by the frictional contact of the washer c". In operation the rotation of the wheel D by the handle J will transmit a revoluble movement to the drill-spindle. through the bevelpinion E,and the frictional contact established by the set-screw a will revolve the screw H, so that a downward movement of the drillspindle L, sliding bracket-plate I, with the supported bevel gear-wheel D, and pinion E will thus be effected, and the auger or metal drill F be forcibly pressed into contact with work placed on the table 0.

It may not be necessary in the use of the machine to drill small holes in hard metal to employ a positive and strong feed, and in that case the set-screw 0 may be relaxed slightly, so that a slow downward motion is given to the drill as compared to its rotary motion.

This device is available for general use as a wood-boring machine, and is particularly valuable in the framing of timber or manufacture of fence-posts. By a simple change of cutting tools to substitute a metal drill for an .or table to dispense with the upright column A, and so be operated for drilling metals or boring holes in wooden material.

Other slight changes might be made in the form and combination of parts of this machine and not depart from the spirit of my invention; hence I do not wish to limit myself to the exact forms herein shown; but,

Having fully described my invention,what I claim as new, and desire to secure by Letters Patent, is

1. In a wood-boring and metal-drilling machine, the combination, with a bracket-frame, and perforated and threaded bosses integral with the frame, of a hollow feed-screw, a drillspindle extending through this screw lengthwise, a set-screw for locking the feed-screw and drill-spindle together, a sliding bracketplate, a driving bevel gear-wheel mounted on a stud that projects from the bracket-plate, and a bevel-pinion secured to the drill-spindle, substantially as set forth.

3. In a wood-boring and metal-drilling machine, the combination, with a hollow feedscrew,a drill-spindle,a balance-wheel mounted on the drill-spindle, a bevel-pinion, and drillchuck secured to the lower end of the drillspindle, of a bracket-frame, a sliding bracketplate, a bevel gear-wheel revolubl y supported on the bracket-plate to mesh with the bevelpinion, a frictional feeding device that transmits motion from the drill-spindle to the feedscrew, and a crank-handle secured to the driving bevel gear wheel, substantially as set forth.

3. In a wood-boring and metal-drilling machine, the combination, with a bracket-frame, of a hollow feed-scrcw, a drill-spindle located in the feed-screw concentric with it, an adj ustable frictional feeding device that transmits rotary motion from the drill-spindle to the feed-screw, a bevel gear-wheel, a bevel-pinion, a crank to rotate the drill-spindle, a balancewheel located on the top of the drill-spindle, and a sliding bracket-plate carrying the gearwheel, this bracket-plate and the drill-spindle, together with its actuating gear-wheel, being vertically reciprocated by the feed-screw when .the frictional feed is adjusted to clamp the drill-spindle and feed-screw together, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

HARLIN LONGVVELL. Witnesses:

R. K. SKINNER, L. K. PARKHURST. 

